Abstract: A lot of emphasis is being made on integrating renewable energy sources like solar energy, wind energy into DC distributed power system and DC micro grids. When large proportion of power is being generated from renewable energy sources, there will be power quality and grid stability issues. This paper presents an electric active suspension technology known as the DC electric springs for stabilizing and improving the quality of the power distributions in DC microgrids. DC electric spring can be used for (i) regulating the DC bus voltage within the required limits while enduring the fluctuations of intermittent energy sources or deep voltage sags of power faults and (ii) performing load boosting and shedding functions to match the power consumption of the DC loads to the renewable power generation connected to the DC grids. Simulations results show that the above conditions can be achieved in the DC microgrids and the quality issues can also be mitigated using the proposed DC electric spring technology.
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